Uploaded December 2021 | Updated September 2026, 3 weeks ago
Part 2 of the extremely trying battery box build. The new box works, but there were still challenges along the way. This video ends (rather abruptly) and the end of the box build.
In the next video, we're back to actual battery stuff, assembling the battery in the new box. Thank you for bearing with me through this... The last two videos are not to the standard I wish they were, but so it goes. :)
On dimensions; Let me finish the box design and I'll do a full shareable build plan.
0:00 - Review of second build
1:15 - Testing version 2, take 2
5:00 - Size comparison to v1
5:58 - Cutting slots for main cables in the divider
9:27 - Notes on practising on prototypes
10:01 - On switching to the JK BMS
10:48 - Deciding where components will go
12:00 - @OffGridGarageAustralia , the BMS manual!
13:30 - Mounting the SmartShunt
15:20 - Mounting the SmartShunt, try 2
16:43 - Flush-mounting the captive nuts
19:45 - An ode to my bench
20:45 - Deciding where to put the BMS
23:48 - Making mounts for the BMS on the divider
25:40 - The value of hand tools
30:45 - Making a handle for the divider
32:20 - The wrong tool for the job
34:00 - Frustrated use of hand tools
35:17 - Testing the handle, happiness!
36:00 - Cheap plywood woes, captive nut failure
37:05 - Scarfing in a repair piece of plywood
38:55 - Filming failure, scarf glue-up review
39:35 - Audio failure, captive nut success
Part 2 of the extremely trying battery box build. The new box works, but there were still challenges along the way. This video ends (rather abruptly) and the end of the box build.
In the next video, we're back to actual battery stuff, assembling the battery in the new box. Thank you for bearing with me through this... The last two videos are not to the standard I wish they were, but so it goes. :)
On dimensions; Let me finish the box design and I'll do a full shareable build plan.
0:00 - Review of second build
1:15 - Testing version 2, take 2
5:00 - Size comparison to v1
5:58 - Cutting slots for main cables in the divider
9:27 - Notes on practising on prototypes
10:01 - On switching to the JK BMS
10:48 - Deciding where components will go
12:00 - @OffGridGarageAustralia , the BMS manual!
13:30 - Mounting the SmartShunt
15:20 - Mounting the SmartShunt, try 2
16:43 - Flush-mounting the captive nuts
19:45 - An ode to my bench
20:45 - Deciding where to put the BMS
23:48 - Making mounts for the BMS on the divider
25:40 - The value of hand tools
30:45 - Making a handle for the divider
32:20 - The wrong tool for the job
34:00 - Frustrated use of hand tools
35:17 - Testing the handle, happiness!
36:00 - Cheap plywood woes, captive nut failure
37:05 - Scarfing in a repair piece of plywood
38:55 - Filming failure, scarf glue-up review
39:35 - Audio failure, captive nut success







![Ep. 95 - 2 Throttles, 2 Motors, 1 Brain - DIY Helm Controls
Ive been deep into learning STM32 embedded development, and Im finally starting to come up from under the rock Ive been hiding under.
This vide is pretty technical, and probably not the most interesting. However, I wanted to make it anyway because projects are not all sparks and excitement. Working through long, slow spans of learning to do something is a real part of taking on big projects.
] STM32 Helm v01 - As of May 12, 2024
* https://github.com/digimer/Mermaids-Rest/tree/78fa891de9739584ab1d5a6e4e652a4f4edd9295
] Helm Controls Planning Doc
* https://docs.google.com/document/d/1GbOjI1D3vNJ4GQJFe-qQDrf0KEiA9gw_H1Upa65IYns/edit?usp=sharing
] Channels that have Helped Me;
* @ProjectBrupeg
* @OffGridGarageAustralia
* @AcornToArabella
* @BillCarlson
] Chapters
0:00 - Intro / Its Spring
0:42 - Helm Control Progress So Far
2:11 - Why Am I Doing This?
3:20 - Four Devices with on Two Addresses
4:25 - Two Motors, Two Throttles
6:56 - The Genius and Limitations of Arduino
9:05 - Using Pins on STM32 vs Arduino
12:30 - DMA on STM32 and Other Efficiencies
16:30 - Displaying Data; Serial, LCD, Screen and Dashboard
21:51 - DAC Testing, Calibration, and Durability
24:58 - Prototype board, PCB Plans, and Cables
27:09 - Debug The DACs With Me!
37:11 - Bad Wiring! The Benefits of Planning Docs
41:31 - Kelly Controller Minimums and Maximums
43:47 - This Is What Learning Is Like
44:27 - Calibrating My Specific DACs
53:37 - Whats Coming?
54:32 - New Parts; A HUGE Thanks to my Patrons! Ep. 95 - 2 Throttles, 2 Motors, 1 Brain - DIY Helm Controls](https://i.ytimg.com/vi/xbwvNXn1K7U/mqdefault.jpg)

![Ep. 106 - Shaving My Box - Battery Prototype Pt. 2
In this video, I shave down 75mm / 3 in the port/starboard width off the battery box. Will that be enough? I dont know, and wont until the next video. With the box thinned, I finish the rebates for the vertical separators and the mid-plate.
Happy holidays!
] Patreon:
- https://www.patreon.com/TheDigitalMermaid
] Channels that have Helped Me;
* @ProjectBrupeg
* @OffGridGarageAustralia @OffGridGarageAustralia
* @AcornToArabella
* @BillCarlson
] References;
DIY Mobile Workbench with Table Saw & Miter Saw
- https://tylynnm.com/diy-mobile-workbench-with-table-saw-miter-saw/
Laguna Tools Dado Stack (image reference)
- https://info.lagunatools.com/the-incredible-dado-blade
Shaving My Box - Battery Prototype Pt. 2
] Chapters
0:00 - A New Plan
1:38 - A Plan to Remove the Cells In-Situ
2:46 - How Much Can The Box be Shaved?
3:58 - Loading, Swelling and Padding
6:54 - Cutting on the Floor and Better Ways
9:28 - Shaving My Box, Cutting Tongues
11:20 - Mistakes Upon Mistakes
13:13 - Vertical Support Rebates
14:41 - Yes, More Mistakes
16:41 - OK, Still More Mistakes, WTF...
18:44 - Learning From Mistakes
20:57 - Complex Design
22:19 - Rough Assembly
23:49 - Test Fitting After the Shave
25:18 - Mid-plate In-Situ Install Concerns
27:21 - Potential Height Savings Ep. 106 - Shaving My Box - Battery Prototype Pt. 2](https://i.ytimg.com/vi/xueNpwUaeYs/mqdefault.jpg)
